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Sometimes have a hiss of steam, but that's only when I've dosed too much/too fine and I'm putting a load of (too much) pressure through it.
When was the last time you replaced the gasket there? I think I've changed that one (I've definitely done the one in the grouphead so assuming I changed the one between the group and boiler), but that was maybe 2-3 years ago.
mmccarthy-
I just took it apart - the o-ring seems fine, but the plastic piece that the siphon tube goes into is perished to the point of crumbling away.
I'll see if replacing that helps, but in the meantime, PTFE tape is cheap and plentiful.
I've considered making a paper / cork gasket bodge that covers whole surface. For £4, might be worth a look.
NotThamesWater
On a non-descaling note, the join between the group head and boiler cylinder on my Europiccola is doing far more than just hissing a small bit of steam when I'm pulling a shot, and it's letting a lot of water out at times.
This is even after tightening the bolts every so often.
Do you / anyone else have this problem?